Friday

Capraesque improv: BATS Improv presents “It’s a Wonderful Improvised Life,” a holiday play created on the spot in the spirit of a Hollywood fable. [8 p.m., Bayfront Theater, Building B, Fort Mason Center, S.F.]

Rising comic: Ted Alexandro performs at the Punch Line Comedy Club. Two Comedy Central specials and appearances with David Letterman and Conan O’Brien are on his résumé. [8 and 10 p.m., 444 Battery St., S.F.]

Sunday

A great bike ride

SFBC Freedom from Training Wheels: Who can teach your tyke how to pedal like a big kid? San Francisco Bicycle Coalition volunteers have successfully taught lots of little ones how to ride without training wheels. Join the SFBC in the car-free area of Golden Gate Park for a group effort to get our kids to ride without training wheels. Bring bike, helmet and some snacks to share. Rain cancels. [1 to 2:30 p.m., JFK Drive, west of Conservatory Drive, Golden Gate Park]